/* Qilin - a Java Pointer Analysis Framework
 * Copyright (C) 2021-2030 Qilin developers
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3.0 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 *
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * <https://www.gnu.org/licenses/lgpl-3.0.en.html>.
 */

package qilin.core.pag;

import qilin.core.sets.DoublePointsToSet;
import qilin.util.Numberable;
import sootup.core.types.Type;

/** Represents a simple of pointer node in the pointer assignment graph. */
public class ValNode extends Node implements Comparable, Numberable {

  protected ValNode(Type t) {
    super(t);
  }

  public int compareTo(Object o) {
    ValNode other = (ValNode) o;
    return other.getNumber() - this.getNumber();
  }

  /** Returns the points-to set for this node. */
  public DoublePointsToSet getP2Set() {
    if (p2set != null) {
      return p2set;
    } else {
      p2set = new DoublePointsToSet();
      return p2set;
    }
  }

  /** Delete current points-to set and make a new one */
  public void discardP2Set() {
    p2set = null;
  }
}
